2
circulator may be located on the return line
as shown in the diagram or in the supply
p
iping if desired. The aquastat is wired at the
factory. For power and thermostat wiring see
Figures 2, 3 and 4 in this manual and the
wiring diagrams in the thermostat manufac-
turer’s manual. For piping and wiring of other
system components, see the manufacturer’s
installation manuals. An Expansion Tank (not
provided) must be matched to the system
and installed in accordance with the manu-
facturer’s recommendations. See the manu-
facturer’s instructions for sizing the expan-
sion tank. Do not under-size the expansion
tank. A bypass loop may be installed to
improve tankless coil performance. See
Figure. 7.
3) The tankless water heater may be piped as
shown in Figure 6. A mixing valve, not sup-
plied, must be used to reduce the water
temperature at kitchen or bathroom taps.
High temperature water for a dishwasher
may be obtained by piping as shown in
Figure 6. The nuts that secure the tankless
coil flange should be tightened before the
boiler is filled with water, after initial firing and
once a year during the annual maintenance.
DETERIORATION DUE TO COIL GASKET
LEAKS WILL VOID THE WARRANTY.
4) The VT series boilers are equipped with an
air eliminator feature that uses a dip tube
construction on the boiler supply fitting. This
feature allows quiet air free operation of your
hot water system by assuring the removal of
air pockets without the installation of Air
Scoops to trap noisy air.
The 1-1/4" supply line or Riser tapping in the
top of the boiler extends approximately 1"
below the top or waterline of the boiler, thus
allowing only air free water to enter the supply
to the heating system. The air trapped in the
top of the boiler is then purged through a 3/4"
vent tapping to be released with an (1) auto-
matic float vent (2) a manual vent or (3) piped
into a conventional type expansion tank.
Relief valve discharges and drain valve pip-
ing should be piped to a safe place of dis-
charge. All plugs and water connections
should be checked for leaks upon installa-
tion and annually.
5) Be certain the chimney is clean and free of
obstructions. Connect boiler flue outlet to
c
himney using galvanized smoke pipe. The
flue pipe should be pitched upward at least
1/4" per foot of run. Refer to Page 1 in this
manual for proper size flue pipe for your
model boiler. Use only elbows and straight
sections. Tees may be used in a straight sec-
tion in conjunction with a barometric draft
regulator; however, they must not be used
for a 90° turn. Each joint should be securely
fastened with sheet metal screws. The flue
pipe must not be inserted beyond the inside
wall of the chimney. Install barometric draft
regulator in the horizontal or vertical section
of the flue pipe. The chimney should provide
a minimum of .04 draft at the boiler flue out-
let. A draft of .04 is ideal. The draft losses for
VT Series Boilers are listed below.
MODEL Firing Draft
Rate Loss
0.65GPH .002
0.75GPH .005
VT700E
0.85GPH .015
1.00GPH .020
1.10GPH .005
1.35GPH .010
VT1000E
1.50GPH .020
1.65GPH .025
6) The boiler room must be well ventilated to
allow sufficient make-up air to support com-
bustion. Lack of adequate combustion air
may result in erratic operation of the burner,
noisy combustion or fuel odors. Remember
your need for outside air will be greatly
increased if you have a vented dryer in the
basement or other venting fans in the home.
Boilers located in confined spaces shall be
provided with two permanent openings, one
near the top and one near the bottom of the
enclosure. Each opening shall have a free
area of not less than one square inch per
1000 BTU per hour input rating of the boiler,
freely communicating with interior areas hav-
ing adequate infiltration from the outside.
7) Fill boiler and system with water. Be sure
entire system has been purged of air and the
desired pressure is obtained.
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